Your vessel departs Yokohama from position LAT 35°27.0'N, LONG 139°39.0'E (ZD - 9), at 1330 ZT on 23 July, bound for Seattle at position LAT 47°36.0'N, LONG 122°22.0'W (ZD +8). The distance by great circle is 4,245 miles, and you estimate that you will average 13.6 knots. What is your estimated ZT of arrival?
Official USCG Answer & Rule Citation
Correct Answer: Option A — 2038, 4 August
Zone descriptions govern time adjustments across meridians. Dividing great circle distance by speed yields total passage hours. Adding elapsed time and applying zone differences (+8 Seattle, -9 Yokohama) shifts the departure timestamp to arrival at 2038 on 4 August.
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